TY  - JOUR
A1  - Winship, C.
A1  - Morgan, S.L.
T1  - The estimation of causal effects from observational data
Y1  - 1999
DO  - 10.1146/annurev.soc.25.1.659
JF  - Annual Review of Sociology
VL  - 25
SP  - 659
EP  - -706

ER  -